When specifying multiple values, enter them as a comma-separated
list. The %header% and %properies% values are
not case sensitive. For example, you could use
"%header%,%properties%" for all the JMS header fields and
user properties. However, the enumeration of individual JMS header
fields and user-defined properties are case sensitive. To enumerate
only individual JMS header fields you could use "%header, name,
address, city, state, zip" .

Note:

The JMSMessageID field is always logged and cannot be
turned off. Therefore, if the Message Logging Format is not defined
(i.e., null) or is defined as an empty string, then the output to
the log file contains only the JMSMessageID of the
message. Gets the "message-logging-format" element